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When this card is flipped face-up: Special Summon 2 "Mecha Phantom Beast Tokens" (Machine-Type/WIND/Level 3/ATK 0/DEF 0). This card's Level is increased by the total Levels of all "Mecha Phantom Beast Tokens" you control. While you control a Token, this card cannot be destroyed by battle or card effects. You can Tribute 1 Token, then target 1 "Mecha Phantom Beast" monster in your Graveyard; Special Summon that target. You can only use this effect of "Mecha Phantom Beast Hamstrat" once per turn.

As a result, AG Beast's effect (which states "negate the effects of monsters destroyed by this card in battle") applies first before the Special Summoning of the tokens, thus the effect that Special Summon of the tokens are negated.

I don't know whether the above case is what happened to you or not since you didn't explain the whole thing, but basically, if you're very sure nothing should prevent the effect from activating, then it might be a bug.

lets say you spawn 2 tokens but your Hamstrat is dead... next turn you can set facedown another hamstrat and with the surviving tokens from last turn it will be still protected... iam 90% sure even if facedown if i remeber correct

The hamstrat + the other 2 mechabeasts are made to swarm the field with tokens and to revive other mecha beasts from the gravejard.... with the scrapfactory its pretty much endless tokens and mechabeasts... totaly overpowered card... i have 4 by the way.... but only 1 treebornfrog :(